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T T w w o o S S t t a a g g e e C C o o o o l l i i n n g g
1. See sequence of operation for Single stage cooling
operation above (steps 1-3).
2. R-Y2 contact on the thermostat close sending
24VAC to Y2 low voltage terminal on the IFC.
Technician should read 24VAC between Y2 and B/C.
3. 24VAC is sent to the OD unit via thermostat wiring.
4. The indoor airflow ramps to 2nd stage airflow. The
seven segment LED for example will read:
•
C C L L 2 2 = Cooling, Stage 2
•
A A R R F F = Airflow
1 1 6 6 0 0 = 1600 calculated cfm (value shown x 10)
•
5. When the temperature is lowered enough to satisfy
the thermostat setting, contacts R-Y1-Y2-G will
open.
The OD unit shuts off and the indoor blower shuts
off, unless a blower off delay has been enabled in
the IFC setup menu options. The seven segment
LED will read I I D D L L = Idle, no thermostat demand.
S S i i n n g g l l e e S S t t a a g g e e H H e e a a t t P P u u m m p p
N N o o t t e e : : Factory supplied Y1-O jumper must be removed
for proper seven segment LED readout and
defrost operation.
1. R-Y1-G contacts on the thermostat close sending
24VAC to the Y1 and G low voltage terminals on the
IFC. Technician should read 24VAC between Y1-B/C
and between G-B/C.
2. 24VAC is sent to the OD unit via thermostat wiring.
3. The indoor blower ramps to the HP heating airflow.
The seven segment LED for example will alternately
read:
18-CE15D1-1C-EN
•
H H P P 1 1 = Heat Pump Heating, Stage 1
•
A A R R F F = Airflow
•
0 0 8 8 0 0 = 800 calculated cfm (value shown x 10)
4. When the temperature is raised enough to satisfy
the thermostat setting, contacts R-Y-G will open.
5. The OD unit shuts off and the indoor blower shuts
off, unless a blower off delay has been enabled in
the IFC setup menu options. The seven segment
LED will read 1 1 D D L L = Idle, no thermostat demand.
T T w w o o S S t t a a g g e e H H e e a a t t P P u u m m p p
1. See sequence of operation for single stage heat
pump operation above (steps 1-3)
2. R-Y2 contact on the thermostat close sending
24VAC to Y2 low voltage terminal on the IFC.
Technician should read 24VAC between Y2 and B/C.
3. 24VAC is sent to the OD unit via thermostat wiring.
4. The indoor airflow ramps to 2nd stage airflow. The
seven segment LED for example will read:
•
H H P P 2 2 = Heat Pump Heating, Stage 2
•
A A R R F F = Airflow
•
1 1 6 6 0 0 = 1600 calculated cfm (value shown x 10)
5. When the temperature is raised enough to satisfy
the thermostat setting, contacts R-Y1-Y2-G will
open.
6. The OD unit shuts off and the indoor blower shuts
off, unless a blower off delay has been enabled in
the IFC setup menu options. The seven segment
LED will read 1 1 D D L L = Idle, no thermostat demand.
S S e e q q u u e e n n c c e e o o f f O O p p e e r r a a t t i i o o n n
45
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